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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8320fcb78f29c313c269520a8e26fce1d31141790fe9e2c90c9599e5a93b4625' 
  AND token = 'L9NRAiOSGLW2oP4l0lXtqFGhRqASzVeuEus2LrVNEvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}